days = "Mon Tue Wed Thu Sat Sun"

months = "Jan\nFeb\nMar\nApr\nMay\nJun\nJul\nAug"

print("有哪些星期：", days)

print("有哪些月份：", months)
#python中变量引用的另一种方式 a = 'all' print("{}".format(a))
a = 'all'
print("{}".format(a))